Improvement in drawing-knives



THOMAS MfvcLAR'K.

Improvement in Drawingv Knives.

No. 121O8A.` Patentd N0v. 21,1a71.

NITED STATES IMPROVEMENT IN DRAWING-KNIVES.

Specication forming part of Letters Patent No. l21,084, dated November 21, 1871.

To all whom it may concern:

Be it known that I, THOMAS M. CLARKE, of Winsted, in the county of Litchfield and State of Connecticut, have invented a new Improvement in Drawing-Knives; and I do hereby declare the following, when taken in connection with the accompanying drawing and the letters of reference marked thereon, to be a full, clear, and exact description ofthe same, and which said drawing constitutes part of this specification, and represents in Figure 1, a top or front view; Fig. 2, a transverse section on line a: so; Fig. 3, a tranverse section on line z z; Fig. 4, a perspective view of the blade preparatory to attaching the shanks.

This invention relates to an improvement in the construction of drawing-knives, or what are sometimes called shaves, the object being to produce a better article and at less eXpensethan the common construction, wherein the blade and shanks are forged in one and the same piece; and the invention consists in forming the blade from a flat piece or sheet of steel or other metal, corrugated longitudinally to give the requisite strength, and riveted or otherwise secured to or made a part of the shanks, formed independent of the said blade.

A, Fig. 4, is the blade, which is formed from flat thin metal-may be from sheet metal, and wholly or in part of steeland constructed with one or more corrugations, c, running longitudinally, which strengthens the blade against a transverse strain. B B are the Shanks, made from malleable or wrought metal, so as to lap onto the blade, and riveted thereto, as denoted in Fig. 3, or otherwise united, as by brazing. Riveting, however, is believed to be the best and cheapest; but, if preferred, the blade and shanks may be in one and the same piece.

By this construction I am enabled to roll the metal for the blade in longitudinal strips, which may be cut to the required length, and also to form the shanks from malleable iron; and the process of uniting being extremely simple, I produce a drawing-knife fully equal to the common construction and at a reduced cost.

I claim as my invention- As an article of fmanufacture, a drawing-knife in which the blade is formed from thin metal corru gated longitudinally, substantially as set forth.

THOMAS M. CLARKE.

Witnesses:

RUEUs E. HoLivrEs, GEORGE S. RowE. (49) 

